Abstract
The transport phenomena in microchannel are significant in designing MEMS devices. The current study investigates numerically the simultaneously developing unsteady laminar flow and heat transfer inside a twisted sinusoidal wavy microchannel. At the inlet sinusoidal varying velocity component is applied. Varying pulsating amplitude and frequency represented by the Strouhal number was studied for Reynolds numbers ranging from 1 to 100. The governing equations are solved with a finite volume based numerical method. In comparison with steady flow, it was found that imposed sinusoidal velocity at the inlet can provide improved heat transfer performance at different amplitudes and frequencies while keeping the pressure drop within acceptable limits.
Highlights
In the modern era of high speed computing and intensive use of integrated circuits, the thermal management of devices has become a key area where improvements can be brought
The current study investigates numerically the simultaneously developing unsteady laminar flow and heat transfer inside a twisted sinusoidal wavy microchannel
This is caused by the weak swirl generation at low Reynolds number (Re) as the viscous force predominates in that case over the effect of the channel geometry
Summary
In the modern era of high speed computing and intensive use of integrated circuits, the thermal management of devices has become a key area where improvements can be brought. An experimental and theoretical investigation on single-phase heat transfer in micro channels was done by Hetsroni et al [9] They discussed several aspects of flow in micro-channels as pressure drop, transition from laminar to turbulent etc. They analysed the data of heat transfer in micro-channels with hydraulic diameters ranging from 60 μm to 200 μm They discussed the effects of geometry, axial heat flux due to thermal conduction through the working fluid and channel walls as well as the energy dissipation. Gogineni et al [13] investigated for laminar convective heat transfer co-efficient in a rectangular micro-channel under constant wall heat flux They worked on Reynolds Number ranging between 100 – 400. The main aim was to enhance heat transfer rate by increasing recirculation and mixing of the flowing fluid
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